In Chinese, tomatoes are literally called Red Persimmons from the West (西红柿 = West + Red + Persimmon). This is so because persimmons are native from China, where they are simply called (柿子), where 子 only indicates that the grammatical class of the word is noun (and not, say, verb).
Pictographically cool character:
The meaning is to charge quickly.
It is composed of:
which means gate, and:
which means horse, clearly suggesting that a horseman is barging into someone’s gate.
二 = 2
三 = 3
十 = 10
二十 = 20
三十 = 30
二三是 = around 20 or 30