Post Types « WordPress Codex - 1 views
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it is better if you prefix your identifier with a short namespace that identifies your plugin, theme or website that implements the custom post type. For example: acme_product or aw_product for products post type used by a hypothetical ACMEWidgets.com website
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Namespacing your custom post type identifier will not guarantee against conflicts but will certainly minimize their likelihood.
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Do pay close attention to not having your custom post type identifier exceed 20 characters though, as the post_type column in the database is currently a VARCHAR field of that length.
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