Key:

#: Triangle
u = Inverted U
e = Three horizontal lines
v = Inverted triangle
i = Infinity symbol

7 XeJe BLuW uJ#Q vS3M
14 BRY5 iZKG i5Tu G^L#
15 4LVB WT3F L#N2 e1FX
17 V2BH LYRX ^ZeW ZRGT
19 vKNY V2PN ^3HW G44i