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I know that 記号 is translated as 'symbol' or 'code' while しるし is 'mark' or
'sign' but I can't seem to figure out when to use the appropriate one.

地図にたくさん記号がある。

地図にたくさんしるしがある。

What's the difference between these sentences?
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definitions word-usage
What's the difference between 記号 and しるし？
If you look up [記号](http://jisho.org/search/%E8%A8%98%E5%8F%B7) and
[しるし](http://jisho.org/search/%E3%81%97%E3%82%8B%E3%81%97) in a dictionary,
there are some overlapping meanings such as the
[case](https://japanese.stackexchange.com/questions/41802/%E6%81%A5%E7%9F%A5%E3%82%89%E3%81%9A-%E3%81%AF%E3%81%98%E3%81%97%E3%82%89%E3%81%9A-versus-%E5%8E%9A%E9%A1%94%E7%84%A1%E6%81%A5-%E3%81%93%E3%81%86%E3%81%8C%E3%82%93%E3%82%80%E3%81%A1)
between them, but there are apparently different ones. In particular, "しるし"
has a broader meaning than "記号" and it has a meaning of abstract nuance.

From another point of view, the essential difference between "しるし" and "記号" is
that "しるし" is a sign or mark additionally written on or attached to something
as the proof of confirmation or for later use or convenience, while "記号" is a
written sign or mark to be used as a substitute or symbol of an already
existing entity.  
Therefore, the former is dynamic and the latter is static.

「しるし」と言｛い｝えば[日本人]｛にほんじん｝が最初｛さいしょ｝にイメージするのは、「記号｛きごう｝」ではなく「目印｛めじるし｝」です。目印｛めじるし｝のために、木｛き｝の枝｛えだ｝を折｛お｝る「枝折（しおり）」という言葉｛ことば｝は[姥捨て山/姥捨山(うばすてやま)](https://en.wikipedia.org/wiki/Ubasute)の[話]｛はなし｝の中｛なか｝に出｛で｝てくる母親｛ははおや｝である老婆｛ろうば｝が自分｛じぶん｝の死｛し｝の間際｛まぎわ｝まで息子｛むすこ｝を思｛おも｝う[愛情]｛あいじょう｝の[表現]｛ひょうげん｝として有名｛ゆうめい｝です。本｛ほん｝に挟｛はさ｝む「栞（しおり）
_bookmark_
」も、語源｛ごげん｝は「枝折（しおり）」です。なお、[姥捨て山]｛うばすてやま｝の話｛はなし｝はノーベル賞｛しょう｝をとったアインシュタインが日本｛にほん｝を訪問｛ほうもん｝した時｛とき｝に、「[仏｛ほとけ｝さまとは何｛なに｝か](http://www.koumyouji.com/houwa/31.htm)」と仏教｛ぶっきょう｝の高僧｛こうそう｝に尋｛たず｝ねた答｛こた｝えの中｛なか｝にも出｛で｝てきます。

Talking about "しるし", the first thing we Japanese image is not a "記号｛きごう｝" but
a "目印｛めじるし｝ _marker_ ". For markers, the word with "枝折｛しおり｝" meaning snapping
twigs by the aged mother who comes out in the story of "[姥捨て山]｛うばすてやま｝ a
mountain for _[ubasute](https://en.wikipedia.org/wiki/Ubasute)_ or abandoning
an old woman" is famous.  
The story of 姥捨て山 is roughly like this:  
In one Buddhist allegory, a son carries his mother up a mountain on his back.
During the journey, she stretches out her arms, catching the twigs and
scattering them in their wake, so that her son will be able to find the way
home.

A poem commemorates the story:  
In the depths of the mountains,  
Whom was it for the aged mother snapped  
One twig after another?  
Heedless of herself  
She did so  
For the sake of her son

"栞｛しおり｝ _bookmark_ " that is put between pages of a book to mark a place in it
also has the same ethymology as "枝折｛しおり｝".

In addition, the story of [姥捨て山]｛うばすてやま｝ also appeared in the
[answer](http://www.koumyouji.com/houwa/31.htm) by a high priest of Buddhism
when Einstein who got the Nobel prize visited Japan and asked "What is
Buddha?"  
The priest answered "She is Buddha."
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**記号** ("symbols") on a map typically look like this (See [List of Japanese
map symbols](https://en.wikipedia.org/wiki/List_of_Japanese_map_symbols)):

[![enter image description
here](https://i.stack.imgur.com/Q4deC.png)](https://i.stack.imgur.com/Q4deC.png)

We also have 数学記号 (math symbols), 星座記号 (zodiac symbols),
[錬金術記号](https://ja.wikipedia.org/wiki/%E9%8C%AC%E9%87%91%E8%A1%93%E8%A8%98%E5%8F%B7)
(alchemical symbols) and so on. So each 記号 has been designed by someone and
has its own relatively complex meaning.

On the other hand, a **印【しるし】** ("mark") on a map is usually something like
this:

[![enter image description
here](https://i.stack.imgur.com/9fLp7.png)](https://i.stack.imgur.com/9fLp7.png)
[![enter image description
here](https://i.stack.imgur.com/4Omfr.png)](https://i.stack.imgur.com/4Omfr.png)

印 is just a _mark_ ; it's an indicator that tells something noteworthy is
there, but it may not convey something more complicated than "No", "Look",
"Important", etc. Common 印 Japanese people use are 矢印 (やじるし; arrow), 丸印
(まるじるし; circle), バツ印 (ばつじるし; cross), 星印 (ほしじるし; star). Its shape is often
unimportant when it's used merely as a 印.

**EDIT:** A 印 doesn't even have to be drawn on paper or a screen. A stone
dropped on the ground can [work as a
marker/印](http://darksouls3.wiki.fextralife.com/Prism+Stone).
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