Wooden Shield

The Wooden Shield is a a small shield made of wood, as the name implies. Link carries it in several games in the Legend of Zelda series.

The Legend of Zelda: Oracle of Ages/The Legend of Zelda: Oracle of Seasons
In these games, the Wooden Shield is Link's original shield. In either game it can be optionally replaced with the Iron Shield. It can only be upgraded to the Mirror Shield through a main-linked game.

The Legend of Zelda: Twilight Princess
Here, the Wooden Shield is similar in appearance to the Ordon Shield, Link's first shield. It can be obtained by buying it from the shop in the Goron spring, or from Malo's shop. Unless the Ordon Shield is destroyed by fire, however, the Wooden Shield is a superfluous purchase, as both are eventually replaced by the Hylian Shield, which does not burn.

The Legend of Zelda: Phantom Hourglass
The Wooden Shield in this game appears almost identical to the Hero's Shield in The Wind Waker, except that it has a lobster symbol on it. It can be bought at the shop on Mercay Island for 80 Rupees.