Glazing Points are push-style points that hold the glass against the sash (framework). They are also used to secure pictures in wood frames and made
Glazier's Steel Push Points (50-Pack) GP1HD - The Home Depot
Replacing a Broken Window Pane – Glazing Windows – DIY – Video
Replacing a Broken Window Pane – Glazing Windows – DIY – Video
Hyde Tool — Atlas Preservation
Glazing Push Points, Sage Restoration
75-079 2-IN-1 Glazing Tool
How to install glazing points
Hardware Hubbard Supply Co.
How to Glaze a Single-Pane Window
How to install glazing points