Symbol for On- Complete Guide

What Is the Symbol for On?

The symbol for "on" is ⏻ (Unicode: U+23FB). This is the standard power on symbol you'll find on electronics worldwide. It looks like a circle with a line at the top breaking through it.

You might also see it written as ⏽ (power on symbol, line vertical) or just I in simple contexts. The "I" comes from the binary system — 1 means on, 0 means off.

The Power Symbol: A Quick History

The power symbol was created in 1973 by the International Electrotechnical Commission (IEC). They wanted one universal sign that worked across all devices regardless of language.

Before this, every manufacturer used something different. The IEC picked the circle-with-line design because it was simple, recognizable, and didn't look like anything else on a device.

The symbol has no hidden meanings. The line breaking the circle isn't a gap — it's just how the shape works. Some people think it looks like a 0 and 1 combined, but that's coincidence.

Different Types of On Symbols

Here's how the symbol varies across contexts:

The "I" version is the most common in physical switches. Flip a light switch — the side marked "I" is on. The side marked "O" is off.

How to Type the On Symbol

Windows

• Alt code: Hold Alt and type 9140 on the numeric keypad (⏻)
• Character map: Search for "power" in the Character Map app
• Emoji keyboard: Win + . opens emoji picker, search "power"

Mac

• Character viewer: Control + Command + Space bar
• Search "power" or "circle" to find the symbol
• Copy and paste directly

Mobile (iOS/Android)

• Long-press the period key on your keyboard to access symbols
• Use the emoji keyboard and search "power"
• Copy from a document and save as a text replacement

HTML Codes

• ⏻ → ⏻
• ⏽ → ⏽
• ⚡ → ⚡ (lightning, used as power indicator)

Where You'll See the On Symbol

The symbol appears everywhere once you start looking:

• TV remotes — the power button at the top
• Computer monitors — the physical button and on-screen display
• Phone chargers — the brick sometimes has a small LED that lights up when connected
• Software interfaces — toggles, switches, settings menus
• Kitchen appliances — toasters, coffee makers, microwaves
• Power strips — individual outlet switches

On vs. Off: Reading the Symbols

Most devices use two symbols together:

• ⏻ I — the device is on or needs to be on
• ⭘ O — the device is off or needs to be off

The circle (O) represents zero. The broken circle with line (I) represents one. Binary thinking at its simplest.

Some devices only show the on symbol. If you see just ⏻, pressing it toggles the state. No off symbol means there's no off position — like a push-button on a keyboard.

The Off Symbol Explained

The off symbol is ⭘ (U+2B58) — a hollow circle. On physical devices, it's usually just the letter O.

When both symbols appear on a toggle switch, the position matters:

• Top/Left = On — I side engaged
• Bottom/Right = Off — O side engaged

Quick Reference: Copy-Paste Ready

Here are the symbols you need most, ready to copy:

• ⏻ — Power on (full symbol)
• ⏽ — Power on (vertical line)
• ⭘ — Power off (hollow circle)
• ⏼ — Power standby
• 🔋 — Battery (charged/on)
• 🔌 — Plugged in/power connected

Why the Symbol Matters

You don't need to memorize the Unicode points. You just need to recognize the shapes.

When you're troubleshooting a device that won't turn on, the symbol tells you what state it's expecting. When you're designing an interface, the right symbol prevents user confusion.

The power symbol works because it's universal. No translation needed. A person who's never seen a specific device before still knows what ⏻ means.

That's the whole point — simple, clear, no explanation required.