Blog Change the default title within SharePoint

Add-SPTitle.ps1

Add-PSSnapin Microsoft.SharePoint.PowerShell  

$app = Get-SPWebApplication -Identity <webapplicationurl>  

$markup = @"  
<div id='javascript-breadcrumb' class='ms-core-brandingText'></div>  
<script> 
 this.elm = document.getElementById('javascript-breadcrumb');  
 this.elm.innerHTML = _spPageContextInfo.webTitle;  
</script>  
"@  

$app.SuiteBarBrandingElementHtml = $markup  
$app.Update(); 

Remove-SPTitle.ps1

Add-PSSnapin Microsoft.SharePoint.PowerShell  

$app = Get-SPWebApplication-Identity<webapplicationurl>  
$markup = '<div class="ms-core-brandingText">SharePoint</div>'  
$app.SuiteBarBrandingElementHtml = $markup  
$app.Update();