K_K5 (reference) in projects: vim-8.2.3635

413 #define K_K5		TERMCAP2KEY('K', 'H')	// keypad 5  macro

1001     {K_K5,		(char_u *)"k5"},

1432 	case K_K5:		key = VTERM_KEY_KP_5; break;  in term_convert_key()

/vim-8.2.3635/src/
H A D	keymap.h	`413 #define K_K5 TERMCAP2KEY('K', 'H') // keypad 5 macro`
H A D	term.c	`678 {K_K5, "\316\356"}, 781 {K_K5, IF_EB("\033Ou", ESC_STR "Ou")}, // keypad 5 976 {K_K5, IF_EB("\033Ou", ESC_STR "Ou")}, // keypad 5 1310 {K_K5, "[K5]"},`
H A D	misc2.c	`1001 {K_K5, (char_u *)"k5"},`
H A D	getchar.c	`1795 case K_K5: c = '5'; break; in vgetc()`
H A D	terminal.c	`1432 case K_K5: key = VTERM_KEY_KP_5; break; in term_convert_key()`