>>19742338
>attack
>>19742230
Translingual
Symbol

(computing) The object replacement character, sometimes used to represent an embedded object in a document when it is converted to plain text.
U+FFFC, 
OBJECT REPLACEMENT CHARACTER
←
[U+FFFB] Specials � →
[U+FFFD]
share this codepoint
U+FFFC was added to Unicode in version 2.1 (1998). It belongs to the block Specials in the Basic
Multilingual Plane.
This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. It has a Neutral East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. In text U+FFFC behaves as Contingent Break Opportunity regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.
The Object Replacement Character is used as placeholder in situations, where some object should sit, that cannot be represented in plain text. For example, if you copy a text snippet with an embedded image from a web page to a text editor like Notepad or Vim, the clipboard might choose to replace the image with U+FFFC in the text content.
The Wikipedia has the following information about this codepoint:
Specials is a short Unicode block of characters allocated at the very end of the Basic Multilingual Plane, at U+FFF0–FFFF. Of these 16 code points, five have been assigned since Unicode 3.0:
U+FFF9 INTERLINEAR ANNOTATION ANCHOR, marks start of annotated text
U+FFFA INTERLINEAR ANNOTATION SEPARATOR, marks start of annotating character(s)
U+FFFB INTERLINEAR ANNOTATION TERMINATOR, marks end of annotation block
U+FFFC  OBJECT REPLACEMENT CHARACTER, placeholder in the text for another unspecified object, for example in a compound document.
U+FFFD � REPLACEMENT CHARACTER used to replace an unknown, unrecognized, or unrepresentable character
U+FFFE <noncharacter-FFFEnot a character.
U+FFFF <noncharacter-FFFFnot a character.
FFFE and FFFF are not unassigned in the usual sense, but guaranteed not to be Unicode characters at all. They can be used to guess a text's encoding scheme, since any text containing these is by definition not a correctly encoded Unicode text. Unicode's U+FEFF BYTE ORDER MARK character can be inserted at the beginning of a Unicode text to signal its endianness: a program reading such a text and encountering 0xFFFE would then know that it should switch the byte order for all the following characters.
Its block name in Unicode 1.0 was Special.