Binary ○₂｜appendage｜___｜20260628155835-01-•

Decimal number	Binary number
0	0
1	1
2	10
3	11
4	100
5	101
6	110
7	111
8	1000
9	1001
10	1010
11	1011
12	1100
13	1101
14	1110
15	1111

(echo:: @ ᯤ)