It is impossible to see how many knight crests are in the game of Fire Emblem. If you get the member card from Rennac, at the end of the game, there are secret shops that you can buy them from, so you can have as many crests as you would like! Also, it depends on if you go Erika or Ephraim's way, and there are tons of things that can determine that, so it is impossible to have an exact number, since you can buy as many as you want to.
If you're talking about fire emblem and the sacred stone's Joshua, then you have to talk to him with Natasha the other priest that you get that very same level, sadly he's not as good as you would expect...
you draw the sacred crest on the door in a single stroke. if you dont know what the sacred crest is, then your lost. the sacred crest is the triforces.
The sacred crest is the triforce symbol.
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The actual fire emblem is different in most fire emblem games. in fire emblem 1, 3, and 11 it's a shield belonging to the kingdom of Alkaneia in fire emblem 2 it's not featured, but the game takes place in the same world as 1, 3, and 11 The fire emblem is also not physically featured in fire emblem 4 but it's mentioned in the epilogue as the family crest of the Velthomer family It's not featured in fire emblem 5 either, though fire emblem 5 takes place in the same continent as fire emblem 4 In fire emblem 6 and 7, it is a gem, that is the national treasure of bern. In fire emblem 8, it's one of the sacred stones belonging to the Grado Empire. In fire emblem 9 and 10, it's a bronze medallion, which once belonged to Lehran of the Heron clan. Source: Serenesforest.net
In the temple of the ocean king.
the triforce
The sacred crest is the image of three triangles put together to create one white triangle in the middle.
In the last boss, the crest is an hourglass. But, if you mean the other crest, it's the Triforce.
if you mean crest and emblem yes they have many the official emblem of Ireland is the harp the unoficial emblem which was adopted by the Irish people is the shamrock