Based on the string provided, you are looking at a specific instruction or filename used in the Qualcomm smartphone flashing process (often utilized by tools like QFIL or QPST).
If this is from a "paper" or documentation: prog emmc firehose 8953 ddr.mbn
Bypassing FRP (Factory Reset Protection): Removing Google account locks after a hard reset. Based on the string provided, you are looking
"Load the RAM initialization binary (ddr.mbn) for a Snapdragon 625 device (8953) using the Firehose protocol so the device can accept further firmware writes." Xiaomi Redmi Note 4 (SD625) Xiaomi Mi A1
Understanding the prog_emmc_firehose_8953_ddr.mbn Programmer File