What is 'high surrogate' in SAP BC-I18-UNI - I18N Unicode?

high surrogate - Overview

• Component: BC-I18-UNI

• Component Name: I18N Unicode

• Description: Unicode code point in the range U+D800 through U+DBFF.

high surrogate - Details

• 
  Key Concepts: 
  High surrogate is a term used in the Unicode Standard to refer to a specific range of code points (U+D800 through U+DBFF) that are used to represent characters in the Supplementary Multilingual Plane (SMP). The high surrogate is used in conjunction with a low surrogate (U+DC00 through U+DFFF) to represent characters outside the Basic Multilingual Plane (BMP). 
  
  How to use it: 
  High surrogates are used in conjunction with low surrogates to represent characters outside the Basic Multilingual Plane (BMP). The high surrogate is used to identify the character, while the low surrogate is used to provide additional information about the character. For example, if a character is represented by two high surrogates and one low surrogate, then the first high surrogate identifies the character, while the second high surrogate and low surrogate provide additional information about the character. 
  
  Tips & Tricks: 
  When working with Unicode characters, it is important to remember that high surrogates and low surrogates must always be used together. If a character is represented by two high surrogates and one low surrogate, then all three code points must be present in order for the character to be correctly represented. 
  
  Related Information: 
  The BC-I18-UNI I18N Unicode Support component of SAP provides support for Unicode characters, including support for high surrogates and low surrogates. This component also provides support for other Unicode