A common classification of the Lepidoptera involves their differentiation into butterflies and moths.

Another common classification of championships are by weight classes.

A number of other common classifications follow.

Unarius, as an organization, is strongly opposed to its common classification as a religion.

Here are some of the more common classifications by tissue type:

Jobbik rejects the common classification of the political spectrum in left and right.

The common American classification by size is as follows:

The commonest classification is that used by Jalas, in eight sections:

One common classification divides these languages into four groups: