.HPP File Extension

Header file written in the C++ programming language; may contain data types, constants, and variables; can be inserted into a .CPP source code file using the #include directive; used for storing reusable components of code.

C++ header files are more often seen with the .H extension, which is also used as the default extension for header files for the C programming language.

File used by Haluha Pearls, a Web-based program used for displaying digital designs of plastic beads called "pearls;" saved in a plain text format and contains the pearl pattern including the color and the placement of each pearl on the pearl plate.