gate, and gapura,the first component is seen when we enter a region.

Gate 

is a structure which is the entrance or gateway to a region or area. The gate is often found in Hindu temples and shrines, because the gate is an important element in Hindu architecture. 

The gate is also often interpreted as a gate. In the field of architecture is often called the entrance gate, but the entrance itself can not be interpreted as a gate. The symbol is meant here can also mean an icon of a region or area. In the hierarchy of a gate can be called as iconic as the arch itself is often the first component is seen when we enter a region.