Explore to Object replacement character 
Object Replacement Character is represented by the Unicode code point U+FFFC, a special symbol which is used in text-based systems. It appears when an object (image, video) or special character does not render due to some error, and works as a placeholder to indicate that something is missing. It was added to Unicode version 2.1 in May 1998.
On which platforms or systems does U+FFFC  use?
There are many platforms and systems in which Unicode U+FFFC is used as a placeholder or as an invisible character. The uses of the OBJ character in systems or platforms are described below:
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Word Processors and Text Editors:
Word processors and text editors use this obj Unicode character when the object embedded in the content does not appear. This acts as a placeholder in these platforms.
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Web Pages and HTML Documents:
The Object Unicode also plays a vital role in web pages and HTML documents. It appears in these documents when an image or any media file is missing due to some file path issue or unsupported formats.
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PDF Files:
Object Unicode is used in PDF files when an image or an object does not appear. It maintains the integrity and layout of the document while content is missing.
What are the ways to type the object replacement character ?
You can type this object replacement character in different ways. As this is an invisible character, it can be used in software like Windows and Mac easily by following these steps:
WINDOWS
This object replacement character can be typed in a window by using its correct Unicode code point. If you know the exact number, you can easily insert it. Follow the steps which are described below
- Hold Alt
- Press FFFC
- Release Alt
If you follow these steps, it will create a replacement character in place of missing text or content in your window software.
MAC
The Object Replacement Character  is usually inserted automatically when a system encounters an unsupported embedded object. However, if you want to type it manually on a Mac. Follow the steps which are described below
- Hold Alt ⌥
- Type FFFC
- Release Alt
Faq’s
What is the UTF encoding for OBJ character Unicode?
It follows UTF-8, UTF-16, and UTF-32 encodings, which are explained below:
- UTF-8 Encoding: U+FFFC is encoded as (EF BF BC) in UTF-8. It uses 3 bytes to show.
- UTF-16 Encoding: U+FFFC  is directly represented as (FFFC) in UTF-16. It uses 2 bytes to show.
- UTF-32 Encoding: It shows as (0000FFFC), since UTF-32 always uses 4 bytes.
Do users replace the OBJ character manually in Documents?
Of course, users can replace the object replacement characters  manually with the actual object or content, like images or videos. But it will be available or embedded correctly in the content system.
