K_K6 (reference) in projects: vim-8.2.3635

414 #define K_K6		TERMCAP2KEY('K', 'I')	// keypad 6  macro

1002     {K_K6,		(char_u *)"k6"},

1433 	case K_K6:		key = VTERM_KEY_KP_6; break;  in term_convert_key()

/vim-8.2.3635/src/
H A D	keymap.h	`414 #define K_K6 TERMCAP2KEY('K', 'I') // keypad 6 macro`
H A D	term.c	`679 {K_K6, "\316\362"}, 782 {K_K6, IF_EB("\033Ov", ESC_STR "Ov")}, // keypad 6 977 {K_K6, IF_EB("\033Ov", ESC_STR "Ov")}, // keypad 6 1311 {K_K6, "[K6]"},`
H A D	misc2.c	`1002 {K_K6, (char_u *)"k6"},`
H A D	getchar.c	`1796 case K_K6: c = '6'; break; in vgetc()`
H A D	terminal.c	`1433 case K_K6: key = VTERM_KEY_KP_6; break; in term_convert_key()`