In most Lemmy clients, the ! makes it a link, e.g. !196@lemmy.world. You can also do something similar with users, e.g. @aeiou_ckr@lemmy.world. Note that these links stay on your native instance (e.g. if I linked to !196@lemmy.blahaj.zone it’d still open in lemmy.world for you), but Voyager’s autocomplete makes a normal link (e.g. !196@lemmy.blahaj.zone) that is not instance-independent.