三男: third son; three men

賛意: assent / 三位: third rank / 三尉: second lieutenant

三葉機: triplane

画賛, 画讃: / 臥蚕: a silkworm that is resting in preparation for moulting

calculation / forecast

(rare) computer

(uranography) Winter Triangle - a bright asterism of the northern winter sky. Its corners are the stars Betelgeuse, Procyon, and Sirius.

a triangle (polygon)

spreadsheet - manual calculation of digits in the grids / (computing) spreadsheet - automatic calculation of digits in the grids by using computer.

(uranography) Summer Triangle - a bright asterism of the northern summer sky. Its corners are the stars Altair, Deneb, and Vega.