Informal asian signs for numbers
i suspected it's "花碼"

https://zh-yue.wikipedia.org/wiki/花碼



the unicode has these :)

1 - 〡 (u+3021)

2 - 〢 (u+3022)

3 - 〣 (u+3023)

4 - 〤 (u+3024)

5 - 〥 (u+3025)

6 - 〦 (u+3026)

7 - 〧 (u+3027)

8 - 〨 (u+3028)

9 - 〩 (u+3029)

for zero ( 0 ), just write anything like an "0" (u+0030) or "O" (u+004f), or "o" (u+006f) 

these type of "number" is actively used in hong kong till recent decades.

some pages talked about it's usage:

https://zh-cn.facebook.com/tcsince1915/photos/a.1657230367749275/2146011468871160/?type=3&amp;eid=ARB5I3SCgyyKt9eNdUmCHpbrVbKlbG6wAjwaAYlK3tJF3VbjrZteYQhdBIEjQc79qIQcHQOQMrx-G0z0&amp;__xts__%5B0%5D=68.ARDOTg8CJGB0m-KfLsD4V4t0tU_Dkm-CRGdo7aIL3c9ujZ0Z7PMaCQveHHDUD0OfIC2RRXCia1w39TXjMsJOSRaz8ArswIHmfgIzkFVB81LH52iYD_fk_evIxWof-Ao6HKvC-jd1BFRdudkl0q8oTVBtC41Aw47wngbfZXHLEEY9gqP3mtCdlE_G_c9Ivq33JCJ_IVNsSIEtvH73Kq4hUfQqPHgXVIXljzXeUX6YhHfsRFt9XzExpKjBjnkH0PCB2qu7gEIffNcNwqRPQdWD4JAfeiZzTbQSeGhscdj1Pmhl8_FiKF90c7QfPG-4YumkLbaBtj0wcSqO1Wudu0D2B8Rfrjnx&amp;__tn__=EHH-R

https://www.hk01.com/熱爆話題/52311/紅van集體回憶-〤〥-花碼價錢牌-你知落車俾幾錢

https://lihkg.com/thread/328698/page/1


when i was young, studying in primary school, i needed to learn 0-9 in english, roman numerals, chinese numerals (大寫),   and 花碼,  at the same time :(