EOT

End of Transmission is a control code used in telecommunications and computing. In ASCII, EOT corresponds to the byte 0x04, a non-printing C0 control character designed to indicate the end of a data transmission or block in various protocols. Its exact semantics vary by system; in some contexts it marks completion of a transfer, while others use higher‑level framing that makes EOT less central today.

Embedded OpenType (EOT) refers to a font format developed by Microsoft for embedding fonts in web pages. An EOT file carries a compressed OpenType or TrueType font, typically with the .eot extension and the MIME type application/vnd.ms-fontobject. EOT was widely used with older versions of Internet Explorer, but modern web typography has largely shifted to WOFF and WOFF2 due to improved compression and licensing terms.

End of Train is a railway safety device mounted near the rear of a train to monitor brake pressure and other status data. The End of Train device communicates with the locomotive and/or wayside equipment to confirm that braking systems are functioning and to provide status information for crew and dispatchers. It is a term used in many rail networks to improve operational safety.

Because EOT has multiple, unrelated meanings, the intended sense is determined by context.