What is the meaning of ?

The hiragana syllable (to). Its equivalent in katakana is (to). It is the twentieth syllable in the gojūon order; its position is (ta-gyō o-dan, row ta, section o).

with

and

a particle following a phrase or clause describing the detail, content or manner of the action, similar to a complement, and usually found after dialogue, whether spoken or thought.

if

when

can be attached to some adverbs to (slightly) highlight the explanatory nature of the adverb

when used with the same verb twice, used to mean "every"; constructed using the ren'yōkei first, followed by the rentaikei

short for と金 (tokin): a promoted 歩兵 (fuhyō, pawn) that moves like a 金将 (kinshō, gold general)

sentence ending particle that indicates emphasis or a question

Source: wiktionary.org