Java Properties

Java Properties is a data notation created in 1995.

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.properties is a file extension for files mainly used in Java related technologies to store the configurable parameters of an application. They can also be used for storing strings for Internationalization and localization; these are known as Property Resource Bundles. Each parameter is stored as a pair of strings, one storing the name of the parameter (called the key), and the other storing the value.. Read more on Wikipedia...

Java Properties Wikipedia page
There are at least 6,363 Java Properties repos on GitHub
Java Properties first developed in Oracle Corporation
file extensions for Java Properties include properties
GitHub supports syntax highlighting for Java Properties
See also: (10 related languages)Java, Unicode, Microsoft Notepad, Emacs, Vim, ASCII, Eclipse, Perl, XML, YAML

Example from Linguist:

#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License.  You may
# obtain a copy of the License at
#
#	http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.  See the License for the specific language governing
# permissions and limitations under the License.
#
Dink:net/rptools/maptool/client/sound/dink.mp3
Clink:net/rptools/maptool/client/sound/clink.mp3

Example from Wikipedia:

# You are reading the ".properties" entry.
! The exclamation mark can also mark text as comments.
# The key characters =, and : should be written with
# a preceding backslash to ensure that they are properly loaded.
# However, there is no need to precede the value characters =, and : by a backslash.
website = https://en.wikipedia.org/
language = English
# The backslash below tells the application to continue reading
# the value onto the next line.
message = Welcome to \
          Wikipedia!
# Add spaces to the key
key\ with\ spaces = This is the value that could be looked up with the key "key with spaces".
# Unicode
tab : \u0009
# If you want your property to include a backslash, it should be escaped by another backslash
path=c:\\wiki\\templates
# However, some editors will handle this automatically

Feature	Supported	Token	Example
Comments	✓		# A comment
Line Comments	✓	#	# A comment
Semantic Indentation	X

Java Properties - Data notation

Language features