Embowed and Nowy
A line embowed consists of a single arch.
A line nowy contains a semicircular protuberance in the middle.
The arms of Laerskool Bosveld in South Africa have a field Per chevron embowed trefly, Azure and Argent.
The arms of Léopold-Henri Amyot show "per fess ogivy"; this is based on the ogive or pointed arch.
Chiefs, fesses and palar dividing lines are sometimes seen arched and double-arched (and there is an example of triple-arched), though there is some debate as to whether or not these are lines of partition. That arched can be combined with partition lines can be seen from the arms of South Lanarkshire in Scotland. Arched can also be reversed.
Read more about this topic: Line (heraldry)