115th

The number 115 is the natural number following 114 and preceding 116. In Roman numerals, it is written as CXV. As an ordinal number, 115th refers to the position in a sequence, such as the 115th element or the 115th anniversary.

In mathematics, 115 is a composite number. Its prime factorization is 5 × 23. It is an odd number and not a prime number. It is also a semiprime, meaning it is the product of two prime numbers.

The year 115 AD was a common year starting on a Saturday. Significant events in that year include Emperor Trajan's continued military campaigns and the construction of Trajan's Forum in Rome.

Historically, the 115th Infantry Regiment has seen service in various conflicts. Military units and formations are often designated with ordinal numbers like 115th to denote their specific group within a larger military structure.

In other contexts, "115th" can refer to specific legislative acts, such as a "115th Congress" of the United States, or specific scientific discoveries or standards. The term is inherently contextual, relying on the system or list it is part of.