Flags: Turkey, Algeria, Pakistan, Malaysia
Synonyms: sickle, rounded, lunate, curve
Describing a shape is best done in as few words as possible. Think of the shape as a camera snap shot--you want to capture the gist of what you mean as soon as possible so you can get on with other related (and more important) detail, and the action happening in the scene
A weak example:
The waning moon floated in the night sky like one of Aunt Helga's bloated perogies in a cast iron pot.
What's wrong with this example?
Oh boy. This is a CLASSIC bad comparison. Unless you're going for laughs, of course. Bad laughs. Plus, bloated and floated? Yikes.
A strong example:
The waxing moon hung in the night sky like the top of a shepherd's crook, keeping watch over the world.
Why does this work?
Not only is it apt, it's also symbolic and leaves the reader with a peaceful, safe feeling.