[arketyp]

Treating 'u' and 'n' as symmetric is a bit cheating. Luckily, they are also rotationally symmetric words, like 'snus' and 'pod'.

[tobr]

I always appreciated the rotational symmetry of “up”/“dn” (as seen on some keyboards in the context of Page up and Page down).

[green_on_black]

Holy shit. T I L.

[croes]

Lower case u not so much because in some fonts it's just a smaller upper case U.

But the y is as symmetrical as j or g.

[Fnoord]

Yet the uppercase G is symmetric to 6. Case in point: 604.

[sokoloff]

Interesting choice of ‘snus’ as the example, rather than ‘suns’

[082349872349872]

cf https://en.wikipedia.org/wiki/Ambigram