How can the title &quot;13&quot; be so common?
<p>According to <a href="https://en.m.wikipedia.org/wiki/13" rel="nofollow noreferrer">the Wikipedia disambiguation page for 13</a>, there are nineteen albums, four songs, two movies, two novels, a card game, a manga, a musical and a play all titled &quot;13&quot;, not counting stylizations or alternate forms such as &quot;Thirteen&quot;, &quot;13th&quot;, &quot;Number 13&quot; or &quot;XIII&quot;.</p>
<p>Wouldn't there be some trademark issues?</p>

<p>You cannot copyright a word or name in and of itself, so you can't sue someone for having a novel titled 13 so long as their novel is distinct from your own.   Trademarks can use certain words or word combinations, but often in a way that is stylized or symbolic of a particular unique style and may include font, coloring, and other unique artistic takes.  For example, McDonalds cannot copyright or trademark the letter &quot;M&quot; but it can trademark the &quot;Golden Arches&quot; a unique stylized &quot;M&quot; that they use as signage to at all their locations.   If the name is a brand of a certain product such, then the name can be trademarked but only with respect to that product.   For example, if the Acme Wash-Master is a dish washing machine they can't sue Ace Wash Master, a unique dog bathing system, for using the name &quot;Wash Master&quot; since it's both styled different (Acme uses a dash between words.  ACE uses a space) and non-competitive product lines (most people would not wash dishes in a dog bathing device... and one would certainly hope that no dog owners ever said to themselves &quot;Fido stinks and my tub is busted. The dish washer will do in a pinch!&quot;).</p>

trademark