Unicode Consortium has set Emoji Level for those emojis released earlier. The level of emojis in Unicode 6.0 and 6.1 is L1, and the level of emojis in Unicode 7.0 and 8.0 is L2. There are a total of 1281 emojis with Emoji Level.

However, in the updates after Unicode 8.0, Emoji Level was removed. So all later emojis no longer have Emoji Level.