Yes, but not a straight line.
septahedron
No, but it looks like it. Actually the leter S does have a line of symmetry. Not vertically but horizontally. See, S.
S
S
If the letter P represents the perimeter, and the letter s is representative of the length of each side, then 4s, or the product of the size length and the number of sizes refers to a square.
a square starts with 's'
How about a square or a sector of a circle.
septahedron
The shape you're looking for is "seesaw." It has 11 letters, possesses at least one line of symmetry, and starts with the letter "s." A seesaw can be symmetrical along its central axis.
A shape that begins with the letter "S" and has one line of symmetry is a "star." Specifically, a five-pointed star has one line of symmetry that can be drawn through its center, dividing it into two mirror-image halves. This line bisects the star from one point to the opposite point.
square, star, sphere,semi-circle
Letter S.
Having the shape of the letter 'S'
Letter S.
s
a Square.
A square