In Hong Kong herbal tea shops, you will see a tea called "廿四味" (24 flavours)
(you will also hear "廿蚊" to mean "20 dollars" in small shops)
Are there any other chinese numerals that represent unusual numbers?
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halfelf's answer is correct, but I'll say a little more about how they're used in Cantonese, since the behaviour of these abbreviations is a little unusual there.
廿 jaa6 indeed abbreviates 二十 ji6 sap6. Similarly, 卅 abbreviates 三十 saam1 sap6. But 卅 is pronounced saa1aa6, an unusual tone contour.
Abbreviations for numbers 40 and above are formed regularly: sei3aa6, ng5aa6 and so on.