Red/Yellow card
The signal for a caution or sending off is the same.

The referee will take a note of the player and then hold the card high above the head with an outstretched arm so that it is clear to everyone what action has been taken.

If the player is sent off for two bookable offences, the referee will show the second yellow card before holding up the red card.

It is possible though that a player who has already been booked can be shown a straight red card.