K_K8 (reference) in projects: vim-8.2.3635

416 #define K_K8		TERMCAP2KEY('K', 'K')	// keypad 8  macro

1004     {K_K8,		(char_u *)"k8"},

1435 	case K_K8:		key = VTERM_KEY_KP_8; break;  in term_convert_key()

/vim-8.2.3635/src/
H A D	keymap.h	`416 #define K_K8 TERMCAP2KEY('K', 'K') // keypad 8 macro`
H A D	term.c	`681 {K_K8, "\316\372"}, 784 {K_K8, IF_EB("\033Ox", ESC_STR "Ox")}, // keypad 8 979 {K_K8, IF_EB("\033Ox", ESC_STR "Ox")}, // keypad 8 1313 {K_K8, "[K8]"},`
H A D	misc2.c	`1004 {K_K8, (char_u *)"k8"},`
H A D	getchar.c	`1798 case K_K8: c = '8'; break; in vgetc()`
H A D	terminal.c	`1435 case K_K8: key = VTERM_KEY_KP_8; break; in term_convert_key()`