Does anyone know what's the definition of "rhino horn" or what does it exactly mean?

I have googled it, but I haven't got a satisfactory answer.

Now I know that it is a military parts, functioned on the Roll-on/Roll-off ship and often with the ramp.

Does anyone can help me? Thanks.
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roll-on/roll-off discharge facility
Provides a means of disembarking vehicles from a roll-on and roll-off ship to lighterage. The roll-on/roll-off discharge facility consists of six causeway sections, nonpowered assembled into a platform that is two sections long and three sections wide. When use of landing craft, utility, as lighters is being considered, a seventh "sea end" causeway section, on-powered, fitted with a rhino horn is required. The roll-on/roll-off discharge facility assembly includes fendering, lighting, and a ramp for vehicle movement from ship to the platform. Also called RRDF. See also facility; lighterage.

(From a glossary of military terms)
benita,thank you first.

The information above help me know it more clearer, but I still don't know the exact definition.

Today I checked a maritime dictionary, I find that "rhino" is a US naval slang.It was a floating box used with RRDF.

But "rhino horn" is a horn or have any other means?
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The horn of a rhinoceros?Emotion: smile

Emotion: big smile Nice picture, Marius.
I have ever thinked it before, but a US naval ship bring with a rhinoceros?

Does it have some special means?
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Thank you Nef.

I know that "The truth is that for centuries the two main uses of rhino horn have been ornamental and medicinal.", but it was not related to RRDF.

Maybe it is a naval slang, somesone who severs in the naval can know it.

Am I boring?
Yee haw! I found it. No, of course it has has nothing to do with real rhinos. I speculate that it's called that because of its shape, but I couldn't really see it in the picture. It's what allows you to "hook together" the two parts.

This is taken from http://www.cdmha.org/toolkit/cdmha-rltk/PUBLICATIONS/jp4_01_6.pdf

Causeway Section, Nonpowered (Sea End) (CSNP[SE]). The CSNP(SE) is equipped with a sloping notch and rhino horn. It is used as the seaward end of a causeway pier used by assault forces and the Army and as an administrative pier. The Army also includes one CSNP(SE) as a seventh section of the Army RRDF. The notch is designed to receive the bow of an LST. The rhino horn slips through a hole in the bow ramp of the landing craft, utility (LCU) or landing craft, mechanized (LCM) -8 to hold the LCU or LCM-8 in position while vehicles are embarked and debarked. The CSNP(SE) is shown in Figure IV-5. (I actually couldn't see it very well in the figure specified.)

... LCUs are loaded by placing their bow ramp onto the rhino horn of the RRDF sea-end causeway section.
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