You can find a graphical illustration on this in the last reference.

Based on what the same (English) reference source says, it could be:

(株式)市場 の 取引 終了 時 の中間価格(closing mid-price)を示す横棒のない株価プロット

株価プロット = 株価データの Hi-lo-close プロット

中間価格 = mid-price

But since this is supposedly about Engineering, you may want to change the phrasing a bit --

----＞　終了時の中央値を示す横棒のない(HLC)プロット
----> 終了中央値を示す横棒のないプロット

中央値 = median

This would mean it is just a "hi-lo" plot/chart...

One of the best Math reference sources online is Mathworld:
http://mathworld.wolfram.com/

FYI:

[PDF] Function CatalogFile Format: PDF/Adobe Acrobat - View as HTML
株価データの Hi-lo-close プロット. JFrameChart. JframeChart はチャートを含む ... RGB の色の値を持つ配列とその配列の表す範囲を表示する図を作成. ColorMap ...
jp.xlsoft.com/documents/vni/JMSL30FunCat_J.pdf - Similar pages


組み込むグラフの種類の概要- [ Translate this page ]特定の時間に個々の図を示す、または横棒グラフが項目の比較を示します。 ... high-low-close と open-high-low-close グラフ サブタイプは、株価を追跡するために、 ...
support.microsoft.com/kb/141773/ja - Similar pages


http://fxtrade.oanda.com/help/exchange_graphs.shtml
HLC (High-Low-Close) Bar Chart
HLC bar charts depict currency pair information with a vertical bar and a horizontal bar extending from it.

The vertical bar represents the high and low points of the prices during the period.
The highest point of the vertical bar represents the average of the highest bid and ask rate reached during the period.
The lowest point of the vertical bar represents the average of the lowest bid and ask rate reached during the period.
The horizontal bar represents the closing mid-price for the period, i.e. the sum of the bid and the ask rate divided by two.