Use defines for the different number breaking systems to improve readability.

src/libespeak-ng/tr_languages.c

 	tr->langopts.min_roman = 2;
 	tr->langopts.thousands_sep = ',';
 	tr->langopts.decimal_sep = '.';
-	tr->langopts.break_numbers = BREAK_THOUSANDS; // 1000, 1000,000  1,000,000 etc
+	tr->langopts.break_numbers = BREAK_THOUSANDS;
 	tr->langopts.max_digits = 14;
 
 	// index by 0=. 1=, 2=?, 3=! 4=none, 5=emphasized
 		SetLetterBits(tr, LETTERGP_C, bn_consonants2);
 
 		tr->langopts.numbers = NUM_SWAP_TENS;
-		tr->langopts.break_numbers = 0x24924aa8; // for languages which have numbers for 100,000 and 100,00,000, eg Hindi
+		tr->langopts.break_numbers = BREAK_LAKH_BN;
 
 		if (name2 == L3('b', 'p', 'y')) {
 			tr->langopts.numbers = 1;
 		tr->langopts.stress_rule = STRESSPOSN_1L;
 		tr->langopts.stress_flags =  S_MID_DIM | S_FINAL_DIM; // use 'diminished' for unstressed final syllable
 		SetLetterBitsRange(tr, LETTERGP_B, 0x26, 0x30); // vowel signs, and virama
-		tr->langopts.break_numbers = 0x14a8; // 1000, 100,000  10,000,000
+		tr->langopts.break_numbers = BREAK_LAKH_DV;
 		tr->langopts.numbers = 1;
 	}
 		break;
 		tr->langopts.stress_rule = 6; // stress on last heaviest syllable, excluding final syllable
 		tr->langopts.stress_flags =  S_MID_DIM | S_FINAL_DIM; // use 'diminished' for unstressed final syllable
 		tr->langopts.numbers = NUM_SWAP_TENS;
-		tr->langopts.break_numbers = 0x14aa8; // for languages which have numbers for 100,000 and 100,00,000, eg Hindi
+		tr->langopts.break_numbers = BREAK_LAKH_HI;
 		tr->letter_bits_offset = OFFSET_DEVANAGARI;
 
 		if (name2 == L('p', 'a'))
 			tr->langopts.stress_rule = STRESSPOSN_2R;
 		} else if (name2 == L('n', 'e')) {
 			SetupTranslator(tr, stress_lengths_equal, stress_amps_equal);
-			tr->langopts.break_numbers = 0x2aaaa8;
+			tr->langopts.break_numbers = BREAK_LAKH;
 			tr->langopts.max_digits = 22;
 			tr->langopts.numbers2 |= NUM2_ENGLISH_NUMERALS;
 		} else if (name2 == L('o', 'r'))
 		tr->langopts.param[LOPT_UNPRONOUNCABLE] = 1; // disable check for unpronouncable words
 		tr->langopts.numbers = NUM_OMIT_1_HUNDRED;
 		tr->langopts.numbers2 = NUM2_MYRIADS;
-		tr->langopts.break_numbers = 0x1111110;
+		tr->langopts.break_numbers = BREAK_MYRIADS;
 		tr->langopts.max_digits = 20;
 	}
 		break;
 		tr->langopts.suffix_add_e = tr->letter_bits_offset + 0x4a; // virama
 		tr->langopts.numbers =  NUM_OMIT_1_THOUSAND | NUM_SINGLE_STRESS_L | NUM_DFRACTION_7;
 		tr->langopts.numbers2 =  NUM2_PERCENT_BEFORE;
-		tr->langopts.break_numbers = 0x14aa8; // for languages which have numbers for 100,000 and 100,00,000, eg Hindi
+		tr->langopts.break_numbers = BREAK_LAKH_HI;
 	}
 		break;
 	case L('s', 'l'): // Slovenian
 
 
 		tr->langopts.numbers = NUM_AND_UNITS | NUM_HUNDRED_AND | NUM_SINGLE_AND | NUM_OMIT_1_HUNDRED;
-		tr->langopts.break_numbers = 0x49249268; // for languages which have numbers for 100,000 and 1,000,000
 	}
 		break;
 	case L('t', 'a'): // Tamil
 		tr->langopts.stress_rule = STRESSPOSN_1L;
 		tr->langopts.stress_flags =  S_FINAL_DIM_ONLY | S_FINAL_NO_2; // use 'diminished' for unstressed final syllable
 		tr->langopts.spelling_stress = 1;
-		tr->langopts.break_numbers = 0x14a8; // 1000, 100,000  10,000,000
+		tr->langopts.break_numbers = BREAK_LAKH_DV;
 
 		if (name2 == L('t', 'a')) {
 			SetupTranslator(tr, stress_lengths_ta, NULL);
 		tr->letter_bits_offset = OFFSET_ARABIC;
 		tr->langopts.param[LOPT_UNPRONOUNCABLE] = 1; // disable check for unpronouncable words
 		tr->langopts.numbers = NUM_SWAP_TENS;
-		tr->langopts.break_numbers = 0x52a8; // for languages which have numbers for 100,000 and 100,00,000, eg Hindi
+		tr->langopts.break_numbers = BREAK_LAKH_UR;
 	}
 		break;
 	case L('v', 'i'): // Vietnamese
 			tr->langopts.listx = 1; // compile zh_listx after zh_list
 			tr->langopts.numbers = 1;
 			tr->langopts.numbers2 = NUM2_ZERO_TENS;
-			tr->langopts.break_numbers = 0x00018;
+			tr->langopts.break_numbers = BREAK_INDIVIDUAL;
 		}
 		break;
 	}

src/libespeak-ng/translate.h

 	// bit20=(LANG=zh)  say zero tens
 	int numbers2;
 
-#define BREAK_THOUSANDS   0x49249248
+// Bit 2^n is set if 10^n separates a number grouping (max n=31).
+//                                      0         1         2         3
+//                                  n = 01234567890123456789012345678901
+#define BREAK_THOUSANDS   0x49249248 // b  b  b  b  b  b  b  b  b  b  b  // 10,000,000,000,000,000,000,000,000,000,000
+#define BREAK_MYRIADS     0x11111110 // b   b   b   b   b   b   b   b    // 1000,0000,0000,0000,0000,0000,0000,0000
+#define BREAK_LAKH        0xaaaaaaa8 // b  b b b b b b b b b b b b b b b // 10,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000
+#define BREAK_LAKH_BN     0x24924aa8 // b  b b b b b  b  b  b  b  b  b   // 100,000,000,000,000,000,000,00,00,00,00,000
+#define BREAK_LAKH_DV     0x000014a8 // b  b b b  b b                    // 100,00,000,00,00,000
+#define BREAK_LAKH_HI     0x00014aa8 // b  b b b b b  b b                // 100,00,000,00,00,00,00,000
+#define BREAK_LAKH_UR     0x000052a8 // b  b b b b  b b                  // 100,00,000,00,00,00,000
+#define BREAK_INDIVIDUAL  0x00000018 // b  bb                            // 100,0,000
+
 	int break_numbers;  // which digits to break the number into thousands, millions, etc (Hindi has 100,000 not 1,000,000)
 	int max_roman;
 	int min_roman;