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The Num lock should always be enabled. If it is disabled when you are attempting an alt code, it may cause errors or unexpected results in some applications. For example, Alt+4 could be interpreted as Alt +, ← which causes the browser to go back if the Num lock is disabled.
If your laptop keyboard doesn't have a separate NumPad, you should hold FN button with Alt button while typing the code.
This method does not work for Linux system, but it is possible to use Unicode.

Alarm clock Symbol

The alarm clock is a type of clocks that are designed to show the time. But its main function is to awake people from sleeping or as a reminder of the time. There are different types and different technologies applied in the manufacturing of the alarm clock. The traditional alarm clock has a hammer-like small device and makes the sound of ringing bells. Some of them have advanced technologies like sensors to recognize a person's state of sleep. All smartphones come with alarms.

Some alarm clocks have radio receivers that can be used to awaken the person by automatically turning it on.

The alarm clock symbol in typing indicates the important dates in the text.

How to use and type Alarm clock symbol code?

If your keyboard contains separate NumPad, you should be sure that it is enabled. If it is not, press the Num Lock key to activate it then press hold down the Alt key on the left side. Type the number that represents that character or the symbol you want to insert and then release the insert key.
For example, for the greek letter omega Ω press and hold Alt and the type 0234 and then release.
There is another method that works only for word documents. In this method, you should type the characters first then press Alt and X. For example ( 0234 + Alt + X for greek letter omega ).
If you have a keyboard that doesn't have NumPad here is what will work for you. Find the Function key ( FN ) then presses and hold the function key while holding press and release Num LK key; then release FN key. This method will activate the numeric keypad in your laptop.
Then do the same steps as in the previous example.
Notice that in IBM code you don't use 0 (Alt + 255 ) before the code which is different from the windows generator that requires to add 0 (Alt + 0255 ) before the code.

Table of Symbols and Codes

Symbol	Title / Description	Unicode	Code / HTML Code
🕢	Clock Face Seven-thirty	🕢	🕢
🕥	Clock Face Ten-thirty	🕥	🕥
🕚	Clock Face Eleven Oclock	🕚	🕚
🕒	Clock Face Three Oclock	🕒	🕒
🕡	Clock Face Six-thirty	🕡	🕡
🕙	Clock Face Ten Oclock	🕙	🕙
🕧	Clock Face Twelve-thirty	🕧	🕧
🕖	Clock Face Seven Oclock	🕖	🕖
⏰	Alarm Clock	⏰	⏰
🕝	Clock Face Two-thirty	🕝	🕝
🕤	Clock Face Nine-thirty	🕤	🕤
🕛	Clock Face Twelve Oclock	🕛	🕛
🕘	Clock Face Nine Oclock	🕘	🕘
🕗	Clock Face Eight Oclock	🕗	🕗
🕜	Clock Face One-thirty	🕜	🕜
🕓	Clock Face Four Oclock	🕓	🕓
🕣	Clock Face Eight-thirty	🕣	🕣
🕠	Clock Face Five-thirty	🕠	🕠
🕕	Clock Face Six Oclock	🕕	🕕
⏲	Timer Clock	⏲	⏲
🕑	Clock Face Two Oclock	🕑	🕑
🕟	Clock Face Four-thirty	🕟	🕟
🕔	Clock Face Five Oclock	🕔	🕔
🕞	Clock Face Three-thirty	🕞	🕞
🕰	Mantelpiece Clock	🕰	🕰
🕐	Clock Face One Oclock	🕐	🕐
🕦	Clock Face Eleven-thirty	🕦	🕦