Let's Break Down the Description:

DC3-26/34/50 Pin: This indicates that the connector is available in different pin configurations, specifically 26-pin, 34-pin, and 50-pin variants. The number of pins determines the number of conductive connections or channels the connector can support.

2.54mm Pitch: The pitch of 2.54mm refers to the distance between the center of one pin to the center of the adjacent pin. A 2.54mm pitch is a standard pitch commonly used in electronic components and connectors.

JTAG ISP Male Socket: The connector is designed as a male socket, suggesting it has protruding pins for insertion into corresponding female connectors or receptacles. It is specifically intended for use in JTAG (Joint Test Action Group) and ISP (In-System Programming) applications, indicating its role in programming and testing electronic devices.

Right Angle IDC (Insulation Displacement Connector): The term "right angle" implies that the connector has a right-angle orientation. This is useful when space constraints or specific design requirements call for a connector that directs the cable or connection at a right angle to the PCB (Printed Circuit Board).

Box Headers PCB Connector: The connector is described as a "box header," suggesting a rectangular or box-like shape that facilitates easy insertion and alignment. It is intended for use on a PCB, providing a connection point for various applications, including JTAG and ISP.