Neptu

Neptu is the numeric value of a weton, the sum of the day's neptu (1 to 9) plus the market-day's neptu (4 to 9). The range is 7 to 18. Each neptu value has a nickname and a character (for example, neptu 12 is 'Lakune Kembang'). It is used for choosing auspicious days (favourable neptu values are 12, 14, 17, 18), matchmaking compatibility, and number reference.