HP 15c - Manual (Page 212)

212 Appendix B: Stack Lift and the LAST X Register
LAST X Register
The following operations save x in the LAST X register:
- x H \ k
+ [ H ] ∆
* \ h :
ч ] А ;
a , d p *
q { r c *
‘ / N z
& P[ ' w
∕ P\ o j
! P] @ > 5 through 9
¤ H[ Y f
†
* Except when used as a matrix function.
† f uses the LAST X register in a special way, as described in appendix E.