ERD Symbols and Meanings

Crow's foot notation is used in Barker's Notation, Structured Systems Analysis and Design Method (SSADM) and information engineering. Crow's foot diagrams represent entities as boxes, and relationships as lines between the boxes. Different shapes at the ends of these lines represent the cardinality of the relationship.
The Chen's ERD notation is still used and is considered to present a more detailed way of representing entities and relationships.
To create an ERD, software engineers mainly turn to dedicated drawing software, which contain the full notation resources for their specific database design - ERD symbols and meanings. CS Odessa has released an all-inclusive Entity-Relationship Diagram (ERD) solution for their powerful drawing program, ConceptDraw DIAGRAM.

How to Build an Entity Relationship Diagram (ERD)

ERD Symbols and Meanings

"A world clock is a clock which displays the time for various cities around the world. The display can take various forms:
(1) The clock face can incorporate multiple round analogue clocks with moving hands or multiple digital clocks with numeric readouts, with each clock being labelled with the name of a major city or time zone in the world.
(2) It could also be a picture map of the world with embedded analog or digital time-displays.
(3) A moving circular map of the world, rotating inside a stationary 24 hour dial ring. Alternatively, the disc can be stationary and the ring moving.
(4) Light projection onto a map representing daytime, used in the Geochron, a brand of a particular form or world edvin.
There are also worldtime watches, both wrist watches and pocket watches. Sometime manufacturers of timekeepers erroneously apply the worldtime label to instruments that merely indicate time for two or a few time zones, but the term should be used only for timepieces that indicate time for all major time zones of the globe." [World clock. Wikipedia]
The example "iPhone OS (iOS) graphic user interface (GUI) - Clock application" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Graphic User Interface solution from the Software Development area of ConceptDraw Solution Park.