I think that 8 might be possible, by interlocking two Star Trek symbols as shown below.
Adendum: This candidate may not work, as quarague points out, but I leave it as a potential "how not to" example.
I think that 8 might be possible, by interlocking two Star Trek symbols as shown below.
Adendum: This candidate may not work, as quarague points out, but I leave it as a potential "how not to" example.