プラントル数 でしょう
purantorukazudeshō
1. Probably Planck number.
Noun
#2769091
1. Probably Planck number.
1. to have (e.g. lunch); to take (e.g. vitamins)
1. number; amount
1. plan; scheme
2. (payment) plan; package
1. plural; multiple
2. plural (number)
1. several years; a few years
1. few days
1. to take (a photograph)
2. to record (audio or video); to film